2021 Hyundai Tucson Engine Knock Sensor DTC P132600 TSB

Hyundai has issued Service Campaign 966, identified by Technical Service Bulletin (TSB) 22-01-028H-1, to enhance the engine monitoring logic in various models, including the 2021 Hyundai Tucson. This campaign specifically targets the knock sensor software, which plays a crucial role in detecting abnormal engine bearing noise. The update aims to prevent potentially severe engine damage by improving the system's ability to identify issues early.

This TSB 22-01-028H-1 supersedes a previous bulletin, TSB# 22-01-028H, to include additional vehicles like the 2019-2021 MY Tucson (TL) and 2020MY Elantra GT (PD) in the list of affected models. The campaign ensures that the engine's protective measures are optimized, providing drivers with early warnings and mitigating risks.

Symptoms of the Engine Monitoring Logic Issue

Owners of an affected 2021 Hyundai Tucson may notice several distinct symptoms if the engine monitoring logic detects an issue. The most prominent sign is the "Malfunction Indicator Lamp (MIL) will blink continuously" on the dashboard. This visual alert is a critical indicator that the engine control module (ECM) has identified abnormal engine bearing noise.

Upon detection, the vehicle will automatically enter "Engine Protection Mode." This mode is designed to safeguard the engine from further damage. While in Engine Protection Mode, drivers will experience slower acceleration and a reduced maximum speed. Furthermore, the engine's RPMs will be limited to approximately 1800-2000 RPM, restricting performance to encourage immediate service. Concurrently, the diagnostic trouble code (DTC) P132600 will be stored in the ECM, providing a clear fault identifier for technicians.

What is Service Campaign 966?

Service Campaign 966 is a proactive measure by Hyundai to enhance the knock sensor software within the engine control module (ECM). The primary goal of this software enhancement is to improve the system's ability to detect abnormal engine bearing noise more effectively and before it leads to severe engine damage. The knock sensor is vital for monitoring engine combustion and detecting pre-ignition or detonation, which can be harmful to internal engine components.

By updating this software, Hyundai aims to provide a more robust and responsive engine monitoring system. If abnormal noise is detected, the updated logic will trigger the Malfunction Indicator Lamp (MIL) and place the vehicle into Engine Protection Mode. This allows the driver to safely reach the nearest Hyundai dealer for diagnosis and repair, minimizing the risk of a catastrophic engine failure.

Important Warnings for Owners and Technicians

Hyundai has issued several critical warnings regarding Service Campaign 966 (TSB 22-01-028H-1) that both owners and service technicians must heed:

• "Dealers must perform this Service Campaign whenever an affected vehicle is in the shop for any maintenance or repair." This ensures that all eligible vehicles receive the necessary software update promptly.
• "When a vehicle arrives at the Service Department, access Hyundai Motor America's 'Warranty Vehicle Information Screen (VIS)' via WEBDCS to identify open campaigns." This step is crucial for technicians to confirm if a specific vehicle requires the update.
• "If the Automatic ECU Upgrade process fails, cycle the ignition key to OFF for at least 30 seconds to reset the control unit. Then resume programming using the Manual ECU Upgrade processes." This instruction provides a recovery procedure in case of an unsuccessful software update.
• "After the ECU Upgrade process shows 100% complete, cycle the ignition key again to OFF for at least 30 seconds to reset the control unit. This step is important for establishing normal powertrain communication and to prevent system errors." Proper reset is essential for the new software to function correctly.
• A specific "GDS Vehicle Battery Voltage Warning" states: "If voltage is below 12 volts as per the GDS warning, then select Back and run the engine at least 15 minutes to reach an adequate battery state of charge to prevent ECU Update failure. Cycle the ignition OFF/ON before retrying ECU update again." Maintaining adequate battery voltage is vital for a successful ECM update.
• "You must initially perform all GDS ECU Updates in Auto Mode. If the ECU Update starts but then fails in Auto Mode, perform the update in Manual Mode to recover." This outlines the preferred method for initiating the software update.

Diagnosis and Repair Procedure Overview

The diagnosis for the engine monitoring logic issue, indicated by DTC P132600 and the blinking Malfunction Indicator Lamp, primarily involves confirming the presence of the fault and then proceeding with an Engine Control Module (ECM) software upgrade. Technicians will use Hyundai's Global Diagnostic System (GDS) to perform this update.

Before initiating the software update, it is essential for technicians to verify the current ECM ROM ID. This ensures that the correct software version is being applied. The update process itself involves flashing new software onto the ECM, which contains the enhanced knock sensor logic. This procedure is designed to prevent future occurrences of abnormal engine bearing noise detection and the subsequent activation of Engine Protection Mode.

Detailed Repair Process

The repair for this issue, as outlined in TSB 22-01-028H-1, focuses on updating the Engine Control Module (ECM) software. The general steps for technicians are as follows:

1. Vehicle Identification: Upon a vehicle's arrival, technicians must access Hyundai Motor America's "Warranty Vehicle Information Screen (VIS)" via WEBDCS. This system identifies any open campaigns, including Service Campaign 966, applicable to the specific vehicle.
2. Pre-Update Checks: Before proceeding with the ECM update, the technician must perform several checks. This includes verifying the current ECM ROM ID against the information provided in the TSB to ensure compatibility and the correct update path. Crucially, the vehicle's battery voltage must be checked. If the voltage is below 12 volts, the engine must be run for at least 15 minutes to charge the battery, and the ignition cycled OFF/ON before attempting the update.
3. ECM Update Procedure: The ECU update should initially be performed in Auto Mode using the GDS system. If the update fails in Auto Mode, technicians are instructed to switch to Manual Mode to complete the process. The TSB also refers to TSB 15-GI-001 for additional tablet-based Mobile GDS ECU update information.
4. Post-Update Reset: Once the ECU Upgrade process shows 100% completion, the ignition key must be cycled to the OFF position for at least 30 seconds. This step is vital for resetting the control unit, establishing normal powertrain communication, and preventing system errors.
5. DTC Clearance and Verification: Any diagnostic trouble codes (DTCs) present in the ECM after the update must be cleared. Finally, the engine should be started to confirm proper operation of the vehicle and ensure the issue has been resolved.

Warranty Information

For this Service Campaign 966 (TSB 22-01-028H-1), warranty claims should be submitted on the Campaign Claim Entry Screen. The operation for this service is designated as "ECM UPGRADE" with a standard operation time of 0.3 M/H (Man-Hours). Specific Op Codes are provided for various models and engine configurations, such as 10D021R0 for 2010-2012 MY Santa Fe (CM) vehicles or 10D021RD for 2014-2015 MY Tucson (LM) vehicles.

The causal part numbers (Causal P/N) are also specified, for example, 39104-2G341 for certain Santa Fe models, 39133-2ETA0 for 2016-2021 MY Tucson (TL), or 39131-2EPE0 for 2018-2020 MY Elantra GT (PD). The Nature code for this repair is E13, and the Cause code is ZZ3. If any part not covered by this campaign is found to need replacement while performing this service, and it is still under warranty, a separate claim should be submitted. For out-of-warranty parts, a Prior Approval Request for goodwill consideration is required.

What Owners Should Do

If you own a 2021 Hyundai Tucson and are concerned about the engine monitoring logic or have experienced symptoms such as a blinking Malfunction Indicator Lamp (MIL) or reduced engine performance, it is important to contact your authorized Hyundai dealer. Since this is a service campaign, the necessary ECM software update will be performed free of charge.

Dealers are instructed to perform this Service Campaign 966 (TSB 22-01-028H-1) whenever an affected vehicle is in the shop for any maintenance or repair. You can also proactively schedule an appointment to have the software updated. Providing your vehicle's VIN to the dealer will allow them to check the Hyundai Motor America's "Warranty Vehicle Information Screen (VIS)" to confirm if your specific vehicle is part of this campaign.

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Source: NHTSA ID: 10211667